| 摘要 |
Disclosed is an image display apparatus for dither halftoning a video signal that enters from an external unit and displaying the resulting video signal on a display unit. A dither table, which comprises an array of dither threshold values used by a dither halftoning circuit, is changed based upon the capability of the display unit to display halftone display colors and/or data relating to the number of display colors contained in the video signal. In order to select threshold values, an output value of the dither halftoning circuit, which is at an identical display position in the immediately preceding frame of the video signals is referenced.
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